Is it just me or it was weird, what does it mean?

I was at work. Signing some paper, I was standing, bending over/down to the desk (i wasn't pushing my hips/butt out at all) and this guy came behind me right after i bent over, and standed there kinda closely while i was signing. Then i felt that he lightly touched my back.

But after that he said nothing, he wasn't acting like he did something weird. Is it just me? Did it mean something?

Is it just me or it was weird, what does it mean?
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